package com.mfizz.binlog.impl;

/*
 * #%L
 * mfz-binlog
 * %%
 * Copyright (C) 2012 mfizz
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Utility class for writing the "active" binlog file name to a ".active" file.
 * 
 * @author mfizz
 */
public class BinloggerActiveFileWriter {
    
    private final File file;
    
    public BinloggerActiveFileWriter(File file) {
        this.file = file;
    }
    
    public File getFile() {
        return this.file;
    }
    
    /**
     * Writes the nameOfFile to the file as its content.  Overwrites any of the
     * old content. Flushes the content and then closes the file.
     * @param nameOfFile
     * @throws IOException 
     */
    synchronized public void write(String nameOfFile) throws IOException {
        FileOutputStream fos = new FileOutputStream(file);
        try {
            // convert name of file into a UTF-8 byte string
            byte[] utf8Bytes = nameOfFile.getBytes("UTF-8");
            fos.write(utf8Bytes);
            fos.flush();
        } finally {
            if (fos != null) {
                try {
                    fos.close();
                } catch (Throwable t) {
                    // do nothing
                }
            }
        }
    }
    
}
